Hot-air furnace



' A. F. HARTER.

HOT MR FURNACE.

APPLICATION FILED APR-15' x921 1,398,264. Patented Nov. 29, 1921..

2 SHEETS-SHEET A. F. HA'RTER.

HOT AIR FURNACE.

APPLICAT-IONTILED APR- 15, 1921.

Patented Nov. 29, 1921.

2 SHEETS- SHEET 2.

ru 1r Sitar-rah AUGUSTUS F. HARTER, OF OAK IPARK, ILLINOIS, ASSIGNOR 'IQCEIBBEN 82 SEXTON COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION 9FILLINOIS.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented Nov. 29, 1921.

Application filed April 15, 1921. Serial No. 61,465.

To all whom it may concern Be it known that I, AUGUSTUS F. HARTER, acitizen of the United States, residing at Oak Park, in the county ofCook, State of Illinois, having invented certain new and usefulImprovements in Hot-Air Furnaces, do hereby declare that the followingis a full, clear, and exact description of the same.

My invention relates to clean-outs for hot air furnaces of either thepipe or the pipeless types, and consists in the novel and usefulconstructions herein described and then pointed out in the appendedclaims.

In the accompanying drawings, which illustrate practical embodiments ofthe various features of my invention in furnaces of both said types andin which the same reference numerals indicate similar parts in thedifferent figures,

Figure 1 is a view showing a central vertical section through the upperportion of a pipe furnace embodying my invention; Fig. 2 is across-sectional view showing the arrangement of parts when the c1ean-outis at one side of a pipe furnace; Fig. 8 is a view similar to Fig. 1through the upper portion of a pipeless furnace; Fig. 4 is acrosssectional view showing the arrangement of parts when the clean-outis at one side of a pipeless furnace; Fig. 5 is a detail sectional Viewon the line 5-5 of Fig. 4c, and 6 is a detail view of parts of theclean-out.

In the drawings the reference numerals 1 and 2 respectively designatethe outer casing and face-plate or front of a hot-air furnace, 3 thecombustion-chamber above the usual fire-pot (not shown), 4- thecombustion-dome of the radiator above the combustion-chamber, 5 theannular radiator, 6 the passageway connecting the dome and radiator, 7the smoke-collar of the radiator piped to a chimney flue, 8 the usualclean-out opening in the radiator opposite the smoke-collar, and 9 thehood or top-bonnet. In the pipe type of furnace the hood is providedwith the usual collars 10 for the pipes to convey the warm air to thedifferent rooms as it rises through the casing. In the pipeless type thetop of the hood is open to provide the central warm-air outlet 11 thesurrounding casing direct from the furnace and passes through thecentral, outlet 11, and the cold air flows through the intake 12 and thecoldair passage to the lower part of the outer casing and then passesinto the inside casing where it comes in contact with the heatingsurfaces, is heated ant rises through the outlet 11 to recirculatethrough the building; the inner casing preferablyis lined with asbestosto prevent the heat from radiating through it, and the smoke-collar 7 isprovided with an extension let passing through the outer which isprovided with inwardly directed wings 15 at the sides of the front-plate2 to close the cold-air chamber. All of these parts are of wellknownconstruction and arrangement, with the usual fire-pot and accessoriesbelow the combustion-chamber. In both types it is customary practice toiocate the clean-out opening 8 of the radiator opposite its smokeexit 7and to aline the discharge pipe of this opening with usual clean-outdoor 16 in the front-plate In some instances heretofore thedischarge-pipe of the clean-out opening terminates the space between theradiator and clean-out door, while in others it extends into thisdoor-opening in the front plate, In the former case, the soot and dirtfrom the radiator escape and are discharged into the space between theradiator and casing, and so pass into the stream of air circulatingthroue'h the furnace and into the house. In the latter case, thesmokeexit 7 is always in the same position at the rear of the furnace,and so when the chimney-flue is not in the line of this exit it isnecessary to provide elbows or curves in the connecting smoke-pipe,which interfere with and check the dr ft through the furnace,

Ink

that regardless of the set or the furnace the their nuts'22 bearing onthe former.

smoke-exit may always be in line with the flue, and whichin any radialposition will discharge the soot and dirt from the radiator outside thefurnace and so prevent it from passing into the stream of circulatingthrough the furnace and thence into the house. In practice I provide ashort clean-out pipe 17 and a removable collar 18 that extends throughthe opening of the usual door 16 or through the outer casing as the casemay be. T is collar 18 is detach-- ably connected tothe pipe 17 by anysuitable means, such for example as the elongated bolts 19 passingthrough op'io'site cars 20 and 21 on the inside of the pipe 17 andcollar 18, respectively, and having their heads countersunk in thelatter ears and The inner end of the collar fits over the free end ofthe pipe 1? and" is provided with an internal shoulder 23 which restsagainst this pipe to properly position the collar so that its outer endextends outside the furnace. The radiator is revoluble on thecombustionchamber 8, its dome 5 being mounted thereon by the circulargroove and tongue joint 24% as shown, so that the clean-out may beadjusted or set at any point around the furnace; when the furnace is setso that the smokeexit 7 in its normal position opposite the face-plateis in line with the chimneyfluethe elean-out will be set at the door 16of thetace-plate 2, as shown in Figs. 1 and 3, but when for any reasonthe furnace is set so that its smoke-exit in its normal positionopposite the face-plate would be at an angle to the flue the radiatormay be adjusted on the chamber 3 to bring the smoke-exit in line withthe tlue, this change of position being illustrated in Figs. 2 and 4where the positions of the parts of the pipe furnace and of the pipelessfurnace, respectively, are

shown when the radiator is given quart-er] turn from its position inFigs. 1 and 3 to bring the smoke-exit at one side of the casing and theclean-outat the opposite side. This shifting of the. radiator obviatesthe use of "all elbows or bends in the connecting smokepipe andeliminates the checks or interference with the furnace-draft produced bythem. The radiator may be turned to point the smoke-exit in any radialdirection, and the collar 18 may be correspondingly set with relation tothe casing, and is long enough to extend through the casing 1 or thefaceplate 2 as the case may be. In a pipe, furnace, the collar 18 is ofuniform length and extends through the front opeir ingcovered by. theusual clean-out door 16 when the radiator is set with its smoke-exit 7at the rear ofthe face-plate (Fig. l), or through. an opening out at theappropriate point in the casing 1 when the radiator is set with its exit7 on a different radius ig. 2). In a pipeless furnace, when the radiatoris set with its exit 7 at the rear of the face-- plate the collar 18 isof the same length as in the pipe furnace and extends through the "frontplate 2 at the usual door 16 in the same way as shown in Fig. 3, butwhen the radiator in pipelcss furnace exit on a different radius thecollar is elongated'to pass across the cold-air space between the innerand outer casings, as shown in 4-. This be done by merely lengtheningthe collar or by splicing it; in the latter case, an inner section 180having internal shoulder 230 surrounds the pipe 1."? and enters thecollar 18, beingprovided with internal ears 210 of sufiicient size to isset with its receive the bolts 19 and the supplemental bolts 190, theshanks of the latter passing through the ears 20 to receive theattaching-5 nuts 220. In both types of furnace when the radiator ismoved to a position other than with its collar at the door 16 theopening in'the front-plate may be permanently closed by this door r afiller-cap, and the casings will be pierced appropriate points for thenecessary openings for the smokeexit and clean-out collar. Also, in suchcase the opening in the outer casing for the collar will be closed by adoor 25 swinging on a suitable frame 26 mounted on the casing. 7

I further provide a closure for the clean'out collar. Preferably theinner surface 0:: the outer portion of the collar is and a rearward box32 thereon providing extended bearing surface, and carrying at its innerend an angular wing-33 in the rear of the plane of the inner side of the21 to engage behind the lowest point of an inclined or beveled cam-wayas on the ear to draw the spigot into the bellu'hen the bolts are turnedto locking position, stopshoulders on the ears being provided if desiredto limit the sweep of the wings. Thecap is also provided with oppositepairs of rearwardly projecting lugs 36 and 37 in extension of the bevelor the shirt, the units of each pair being adjacent one of the bolts andspaced above and below the associated bolt a sufficient distance to forma seat in line with the bolt to receive one of the cars 21 when the capis applied. The lugspost tion and center the cap in relation to the earsso that the wings of the bolts engage behind the ears, the face of thehead 27 being provided with arrows to indicate the direction of rotationof the bolts to draw and lock the cap in place.

The closure cap seals the clean-out so that no smoke or gases can escapethrough it. Also, as the cap is carried by the clean-out and isindependent of the casing and front plate, and as the clean-out openingsin both those parts are sufficiently larger than the clean-out to allowample clearance for differences in contraction and expansion of theparts, the clean-out never contacts with the casing. The extreme heat towhich the interior parts of the furnace are subjected in comparison withthe front-plate and cascauses these former parts to expand much morerapidly and extensively than the latter, so that the clean-out rises inits opening in the casing or front-plate as the case may be, and bysupporting the clean-out in dependently of these latter parts theproblem of unequal expansion is eliminated and there is no tendency ofthe several parts to bind or crack, while at the same time a gas-tightclosure of the clean-out is assured.

The doors 16 on the front-plate and 25 on the casing are cup-shape incross-section and their edges fit over and embrace circular beads 38 ontheir frames to make dust-proof closures at their openings. Thefasteningear 39 of each door is also provided with an inwardly directedcurved flange 40 fitting over the top and side of a projection 41 on itsframe, and a threaded pin 42 on the projection passes through a hole inthe ear to receive a wing-nut 43, so that the door is properlv centeredand locked in position.

The sleeve 17 and the clean-out collar constitute a clean-out pipe thatis adjustable to any radial position to locate the 0pposite smoke-collarin line with the fine, and so avoids angles in the smoke-pipe andpermits the furnace to be set in any required position; for example,where the fine is near a corner and the required position of thefront-plate would bring the smoke-collar in its usual relation at therear of the plate so near the other corner-wall that there would be noroom for the smoke-pipe or for an elbow, the clean-out may be adjustedto position in line with the flue without affecting the location of thefront-plate. In any with the outside door, and the bell 2111f spigotjoint between the cap and pipe insures a gas-tight constructlon thatprevents the escape of smoke or gas into the circalating system or intothe furnace-room. The

of the outer wall.

2. A hot-air furnace having a clean-out opening in its outer wall, aradiator having a clean-out pipe of less diameter than and extendingthrough said opening, a closure-cap for said pipe independent of theouter wall, and means on the cap and pipe to look the former in saidposition.

3. A hot-air furnace having a clean-out opening in its outer wall, aradiator having a clean-out pipe in said opening provided with abell-mouth, a closure-cap having a spigot fitting said mouth, and meanson the cap and pipe to center and lock the former in the latter.

4. A hot-air furnace having a clean-out opening in its outer wall, aradiator having a. clean-out pipe in said opening provided with .abell-mouth, a closure-cap having a spigot fitting said mouth, oppositeears in the pipe having beveled ways on their inner faces, andturn-buttons on the cap having inner wings engaging said ways to drawthe bell and spigot joint together and lock the cap in the pipe.

5. A hot-air furnace having a front-plate provided with a clean-outopening, an outer casing having a clean-out opening at one side of theplate, a radiator having a sectional clean-out pipe to extend througheither opening, and a closure-cap mounted in the clean-out pipe.

6. A hot-air furnace having a front-plate providedwith a clean-outopening, an outer casing provided at one side of said plate with aclean-out opening, a radiator having a shouldered clean-0ut collar toextend through either opening, and a closure-cap seated in the clean-outcollar.

7. A hot-air furnace having a front-plate, an outer casing provided atone side of said plate with a clean-out opening, a radiator having aclean-out collar in the casing opening, a closure-cap mounted in theclean-out collar, opposite ears in the collar, bolts connecting the earsand casing, and means on the cap cooperating with the ears to lock thecap in the collar,

8. A'hot-air furnace having a front-plate, ter collar, bolts connectingthe ears and an outer casing provided at opposite sides casing, andturn-buttons on the cap having of the plate with smoke-pipe andclean-out inner Wings to engage the ears to lock the 10 openings, aradiator having a smoke-collar cap in the collar.

5 andv a clean-out collar respectively in the In testimony whereof Iaflix my signature casing openings, a closure-cap mounted on this 80thday of March, 1921. the clean-out collar, opposite ears in the lat-AUGUSTUS F. HARTER.

